"levikanali" - 1 õppematerjal

Side konspekt 2020 / eksami kordamisküsimused

illustrated:  HARQ tööpõhimõte lühidalt: Soft Combining is an error correction technique in which the bad packets are not discarded but stored in a buffer. The basic idea is that 2 or more packets received with insufficient information can be combined together in such a way that total signal can be decoded. HARQ procedure is as follows 18. Miks on oluline CQI (Channel Quality Index) raporteerimine kiires andmeside ühenduses Meil on vajalik teada levikanali kvaliteeti, et paremini hinnata millistes tingimustes mobiil paikneb. CQI stands for Channel Quality Indicator. As the name implies, it is an indicator carrying the information on how good/bad the communication channel quality is. This CQI is for HSDPA. (LTE also has CQI for its own purpose). In LTE, there are 15 different CQI values randing from 1 to 15 and mapping between CQI and modulcation scheme, transport block size is defined as follows (36.213)